Voters in Pennsylvania are very closely divided for the U.S. House race, with 40% intending to vote for the Democratic candidate for the House in their district, and 38% for the Republican. The poll was conducted online September 7-14, 2012.

Sampling method: Respondents were selected from the YouGov’s panel using sample matching. A random sample (stratified by age, gender, race, education, and region) was selected from the 2005–2007 American Community Study. Voter registration, turnout, religion, news interest, minor party identification, and non-placement on an ideology scale, were imputed from the 2008 Current Population Survey Registration and Voting supplement and the Pew Religion in American Life Survey. Matching respondents were selected from the YouGov panel, an opt-in Internet panel.

Weighting: The sample was weighted using propensity scores based on age, gender, race, education, news interest, voter registration, and non-placement on an ideology scale.